The analysts noted that JPMorgan's $2.1 trillion in assets accounted for 17 percent of the $12.1 trillion in assets in the Federal Reserve system, and that all the Federal Deposit Insurance Corp (FDIC) depository institutions combined have just $13.8 trillion.

Cavanagh acknowledged that deposit caps were an obstacle to growth, but added it would not be in the case of an assisted acquisition of a troubled institution, analysts wrote in a note to clients.

By being patient, well capitalized and supportive, JPMorgan probably remains a favored 'go to' solution for regulators in solving other problem situations when otherwise their size might have started to become a constraint, they said.

JPMorgan shares were down about 4 percent at $35.86 in morning trade on the New York Stock Exchange.